Brushless motor having terminals for connecting winding ends to

Details Brushless motor having terminals for connecting winding ends to Brushless motor having terminals for connecting winding ends to

1994-08-09

1997-02-25

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 91, 310194, H02K 1100, H02K 500

Patent

active

056062087

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Technical Field
The present invention relates to a brushless motor. More particularly, the present invention relates to a brushless motor used as a driving source for an electric product such as a video tape recorder or a floppy disk drive.
2. Background Art
A brushless motor of magnet-rotating type comprises a rotor section having a rotor magnet, a stator section having a stator core around which windings are wound, and a driving circuit for controlling the current applied to the windings of the stator core or the like.
As shown in FIG. 13, the stator section of such a brushless motor comprises, for example, a core winding unit 43 composed of a stator core 41 and windings 42 wound around respective salient poles 41c, of the stator core 41; an electrical insulating resin type core holder 44 mounted on a circuit board 45 for supporting the stator core 41 and extending wires between windings 42 while being in the electrically insulated state to the circuit board 45; and terminals 51 fixed on the core holder 44 for relaying the electrical connection between the windings 42 of each phase and a driving circuit on the circuit board 45. Further, the rotor section comprises a ring-shaped rotor magnet 49; a rotor case 48 having the rotor magnet 49 fixed thereto; and a rotary shaft 50 for fixing and supporting the rotor case 48. The rotor section and the stator section are opposed to each other in such a manner that the rotor magnet 49 is positioned outside the stator core 41 and a gap is formed radially between the outer peripheral surface of the salient poles 41cand the rotor magnet 49. The rotary shaft 50 of the rotor section is supported by a bearing holder 46 fixed to the stator core 41. The bearing holder 46 is inserted from the upper part of the stator core 41 so as to pierce into a through hole 41a formed at the center of the stator core 41, a through hole 44a provided at the center of the core holder 44 and a through hole 45a on the circuit board 45, and is fixed to the circuit base board 45 together with the stator core 41 by means of a screw 47 so that a flange part 46a formed on the base of the bearing holder 46 is engaged with a shoulder part 41b of the stator core 41.
In the conventional brushless motor having such an arrangement, the windings 42 of the stator core 41 are electrically connected with the driving circuit (not shown) formed on the circuit board 45 through terminals, or by direct soldering when no terminal is used. For example, in the case of the brushless motor 40 shown in FIG. 13, the windings 42 of U, V and W phases are linked to the driving circuit on the circuit board 45 through terminals 51 fixed to the core holder 44 by a three-phase star connection. As shown in FIGS. 13 and 15, each terminal 51 is formed by a straight flat plate having a clipping portion 51a at a tip thereof and protrudes toward the circuit board 45, and then, the respective terminals 51 are fixed to the core holder 44 so as to be perpendicular to the circuit board 45. The front or rear end portions of the windings 42 of each phase are held by the clipping portions 51a protruding from the core holder 44 toward the circuit board 45, and tip portions 51b are soldered to land parts of the circuit board 45. By the way, the ends of the windings 42 are temporarily fixed to the terminals 51 by holding the ends of the windings 42 by the clipping portions 51a, and thereafter the ends of the windings 42 are electrically connected securely to the terminals 51 by fusing.
When the terminal 51 such as shown in FIG. 15 is used, however, it is necessary to have a space equal to a height H between the core holder 60 and the circuit board 45, since the terminal 51 protrudes so as to come into contact with the circuit board 45 vertically. The height H is obtained by adding the height (the length of a tongue part 51c branching from the body of the terminal 51) of the clipping portions 51a for holding the end of the winding 42, the space in which an electrode (not shown) for fusing can be arranged therei

REFERENCES:
patent: 4361773 (1982-11-01), Mokrzycki
patent: 4616149 (1986-10-01), Best
patent: 4633110 (1986-12-01), Genco et al.
patent: 4779330 (1988-10-01), Genco et al.
patent: 4800307 (1989-01-01), Papst
patent: 5173628 (1992-12-01), Yoshida et al.
patent: 5214331 (1993-05-01), Yonei
patent: 5264816 (1993-11-01), Degenhart et al.
patent: 5280207 (1994-01-01), Nishmura
patent: 5521779 (1996-05-01), Arakawa et al.

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